<s>
The	O
Bendix	B-Device
G-20	I-Device
computer	O
was	O
introduced	O
in	O
1961	O
by	O
the	O
Bendix	O
Corporation	O
,	O
Computer	O
Division	O
,	O
Los	O
Angeles	O
,	O
California	O
.	O
</s>
<s>
The	O
G-20	O
followed	O
the	O
highly	O
successful	O
G-15	B-Device
vacuum-tube	O
computer	O
.	O
</s>
<s>
The	O
G-20	O
system	O
was	O
a	O
general-purpose	O
mainframe	B-Architecture
computer	I-Architecture
,	O
constructed	O
of	O
transistorized	O
modules	O
and	O
magnetic-core	O
memory	O
.	O
</s>
<s>
Single	O
-	O
and	O
double-precision	O
floating-point	B-Algorithm
arithmetic	I-Algorithm
were	O
allowed	O
,	O
as	O
well	O
as	O
a	O
custom	O
scaled	O
format	O
,	O
called	O
Pick-a-Point	O
.	O
</s>
<s>
A	O
special	O
programming	O
language	O
,	O
called	O
20-GATE	B-Device
,	O
was	O
developed	O
for	O
the	O
G-20	O
.	O
</s>
<s>
Usually	O
the	O
two	O
processors	O
ran	O
independently	O
,	O
one	O
CPU	O
handling	O
card-based	O
input	O
,	O
and	O
the	O
other	O
handling	O
jobs	O
submitted	O
through	O
one	O
of	O
16	O
AT&T	O
Dataphones	O
connected	O
to	O
telephone	O
lines	O
,	O
usually	O
via	O
Teletype	O
Model	O
35	O
KSR	O
,	O
Model	O
35	O
ASR	O
and	O
Teletype	B-Application
Model	I-Application
33	I-Application
ASR	O
teleprinters	O
.	O
</s>
<s>
Another	O
feature	O
of	O
the	O
G-21	O
system	O
was	O
its	O
high-speed	O
Philco	O
"	O
Scopes	O
"	O
system	O
-	O
when	O
punched	B-Architecture
cards	I-Architecture
or	O
Teletype	B-Application
Model	I-Application
33	I-Application
ASRs	O
were	O
the	O
common	O
form	O
of	O
I/O	O
,	O
this	O
CRT	B-Device
system	O
allowed	O
for	O
a	O
CRT	B-Device
display	I-Device
of	O
information	O
-	O
and	O
the	O
Spacewar	B-Application
!	I-Application
</s>
<s>
The	O
directory	O
system	O
was	O
called	O
AND	O
-	O
Alpha	O
Numeric	B-Algorithm
Directory	O
.	O
</s>
<s>
The	O
machine	O
was	O
programmed	O
in	O
a	O
dialect	O
of	O
ALGOL-60	O
called	O
ALGOL-20	O
.	O
</s>
<s>
Deviations	O
from	O
Algol-60	O
included	O
the	O
lack	O
of	O
support	O
for	O
recursion	O
,	O
extensions	O
to	O
embedded	O
G-20	O
machine	O
language	O
within	O
ALGOL	B-Language
-	O
WHAT	O
,	O
and	O
a	O
CIT-developed	O
printer	O
formatting	O
language	O
.	O
</s>
